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as I remember the selector shaft hole goes all the way through on pre units and early units, but 68 is not an early motor.
maybe you have a 68 left side case and a 63/64 right side case?
That would be a good place for a gear oil leak, huh..
 

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the 68 cases are sometimes easy to spot even without a serial number. the early 68's had no timing hole in the middle under the carbs, instead they had a timing hole way down under the front of the motor near the oil pressure relief valve, then in mid year 68 they had both timing holes, then in later 68 they went back to the single timing pin hole in the center under the carbs.
but I usually coat the open ended shaft holes with 3Bond or Yamabond and they don't leak.
 

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that is a late 68 but the 68's were all BSW thread, they started changing over to SAE in mid 69 but didn't really get all there until 1970.
I can't think of any reason the 71 650 barrel wouldn't work, the head bolts are 3/8 26TPI and never changed to SAE threads
 
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